Speed up fix for expando-loss conformance test.

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h

Index: third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
diff --git a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
index 5cdf864c651079ab294c6786dbdaa4ad0dd3db8b..9a6c5ac949a96a4955670f73df8083ec11c0be00 100644
--- a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
+++ b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
@@ -37,6 +37,7 @@
 #include "core/layout/LayoutBoxModelObject.h"
 #include "modules/webgl/WebGLContextAttributes.h"
 #include "modules/webgl/WebGLExtensionName.h"
+#include "modules/webgl/WebGLObject.h"
 #include "modules/webgl/WebGLTexture.h"
 #include "modules/webgl/WebGLVertexArrayObjectBase.h"
 #include "platform/Timer.h"
@@ -1039,7 +1040,28 @@ protected:
     // latched into the context's state, or which are implicitly
     // linked together (like programs and their attached shaders), are
     // not garbage collected before they should be.
-    static void preserveObjectWrapper(ScriptState*, ScriptWrappable* sourceObject, const char* baseName, unsigned long index, ScriptWrappable* targetObject);
+    V8CopyablePersistent<v8::Array> m_2DTextureWrappers;
+    V8CopyablePersistent<v8::Array> m_2DArrayTextureWrappers;
+    V8CopyablePersistent<v8::Array> m_3DTextureWrappers;
+    V8CopyablePersistent<v8::Array> m_cubeMapTextureWrappers;
+    V8CopyablePersistent<v8::Array> m_extensionWrappers;
+
+    // The "catch-all" array for the rest of the preserved object
+    // wrappers. The enum below defines how the indices in this array
+    // are used.
+    enum PreservedWrapperIndex {
+        PreservedArrayBuffer,
+        PreservedElementArrayBuffer,
+        PreservedFramebuffer,
+        PreservedProgram,
+        PreservedRenderbuffer,
+        PreservedDefaultVAO,
+        PreservedVAO,
+    };
+    V8CopyablePersistent<v8::Array> m_miscWrappers;
+
+    static void preserveObjectWrapper(ScriptState*, ScriptWrappable* sourceObject, v8::Local<v8::String> hiddenValueName, V8CopyablePersistent<v8::Array>* persistentCache, uint32_t index, ScriptWrappable* targetObject);
+
     // Called to lazily instantiate the wrapper for the default VAO
     // during calls to bindBuffer and vertexAttribPointer (from
     // JavaScript).